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# flask Hello world
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from flask import Flask,request
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app = Flask('app')
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@app.route('/')    # @app.get('/')
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def main():
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    return 'Hello World!'
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@app.route('/<name>')
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def hello(name):
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    if age := request.args.get('age'):
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        return 'Hello {}, 你{}岁!'.format(name, age)
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    return "请求参数错误"
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app.run(debug=True, port=9999, host="0.0.0.0")

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# 可以是 post 等 http 方法
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res = app.test_client().get("/api")
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res.json  # 返回内容

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from flask import Flask, render_template, Response
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import random
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import time
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@app.route('/generate_numbers')
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def generate_numbers():
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    def generate():
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        for _ in range(5):
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            number = random.randint(1, 100)  # 生成随机数字
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            yield f"data: {number}\n\n"  # 使用 Server-Sent Events (SSE) 格式发送数据
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            time.sleep(0.5)  # 每隔 0.5 秒生成一个数字
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        yield "data: done\n\n"  # 发送结束信号
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        headers = {
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            'Content-Type': 'text/event-stream',
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            'Cache-Control': 'no-cache',
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            'Connection': 'keep-alive',
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        }
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    return Response(generate(), headers=headers)

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// 创建 EventSource 连接
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const eventSource = new EventSource('/generate_numbers');
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eventSource.onmessage = (event) => {
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    if (event.data === 'done') {
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        // 请求完成，关闭连接并恢复按钮状态
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        eventSource.close();
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        console.log('Generation complete');
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    } else {
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        // 显示生成的数字
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        console.log('Generated number:', event.data);
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    }
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};
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eventSource.onerror = (error) => {
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    console.error('Error:', error);
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    eventSource.close();
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    console.log('Generation failed');
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};